Method of making grate-bars



W. A. LEDDELL. METHOD OF MAKING GRAIE BARS. APPLICATION-FILED JUNE 9,1920.

1,398,492. Patented Nov. 29, 1921.

FFEQ.

WILLIAM A. LEDDELL, OF DENVER, COLORADO, ASSIGNOR TO THE MINE ANDSMELTER SUPPLY COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

METHOD OF MAKING GRATE-BARS.

Application filed June 9,

To all whom it may concern Be it known that I, WILLIAM A. LnnnnLL, acitizen of the United States, and a resident of Denver, county ofDenver, and State of Colorado, have invented certain new and usefulImprovements in Methods of Making Grate-Bars, of which the following isa specification.

My invention relates to the manufacture of grate bars by a method whichpossesses advantages as hereinafter pointed out over the methods nowpractised.

The grate bar to which this invention is directed is one in which oneface of the bar is provided with spacing projections or pads for spacingthe bars when they are assembled into grate form.

In this style of grate bar as now manufactured, the depth of thespacing-pads or projections on the face of the bar is necessarilylimited owing to the method of manufacture employed and it is an objectof the present invention to provide a method of manufacturing grate barswherein these spacing-pads or projections may be made of any desireddepth.

In the accompanying drawings,-

Figure 1 shows a partially finished grate bar in the form of a grizzly;

Fig. 2 shows a finished grate bar in perspective;

Fig. 3 shows several bars assembled in a grate; and t Fig. 4 shows agrate structure made up of bars formed by my method, being a section onthe line 44 of Fig. 3.

The blank from which the grizzly A of Fig. 1 is formed is first of allpassed through a mill and rolled to form beveled faces B and C thereon,such as indicated in Fig. 2 for example. The bar is then subjected topressure by passing the same through a suit able die press to cause aportion of the face thereof to be depressed out of the plane of the faceC as indicated by D in Fig. 3 to form a tapered projection orspacing-pad E on the beveled face 13 of the bar as indicated in Fig. 2,the face F of this spacingpad or projection in the finished bar beingparallel to the face C so that when the grate bars are assembled into agrate such as illustrated in Figs. 3 and 4: with the bars lyingSpecification of Letters Eatent.

1920. Serial No. 387,599.

side-by-side and drawn together against the spacing-pads or projectionsE, the bars will all he in the same plane as indicated in Fig. 4.

From the foregoing it will be seen that the depth of the spacing-pads Edepends solely upon the depth of the depressions D sothat asdistinguished from the present method 'of manufacturing grate bars thedepth of the spacing-pads is practically unlimited, thereby enabling thegrate openings, that is to say the spaces G and H, to be of any widthdesired.

. It is to be understood that primarily this invention is directed tothe forming of the spacing-pads or projections E and for this reason myinvention is not to be limited to first of all rolling the blank into agrizzly shape.

It is to be understood further that the spacing-pads may be of anydesired shape, the shape shown in the drawings being merelyillustrative.

While the grate bars herein illustrated are straight it is to beunderstood that they may be made in other shapes within the purview ofthis invention.

What I claim is:

1. The method of manufacturing a grate bar which method consists indepressing a portion of one face of a blank out of the.

plane of that face to form a projection or pad on the opposite face.

2. The method of manufacturing a grate bar which method consists insubjecting a blank to pressure to depress a portion of one face of theblank out of the plane of that face and simultaneously form acorresponding projection on the other face of said blank.

3. The method of manufacturing a grate bar which method consists inrolling a blank into a grizzly shape and thereafter depressing a portionof one face of the blank out of the plane of that' face to form aprojection or pad on the opposite face thereof, the face ofwhich'projection is parallel to the face of the blank opposite to thepad.

This specification signed this 2nd day of June,' 1920.

WILLIAM A. LEDDELL.

Patented Nov. 29, mar.

